Cut Circular Dashed Holes into a Disc
Turn your bitmap image to a svg with Inkscape or Illustrator (see a tutorial on bitmap tracing, it's very easy). If you don't know .svg is a standard format for vector images, which will allow blender to interpret the image as curves.
Import svg in blender, convert to mesh, add a solidify modifier (in the modifier turn ON "On Cage" and delete all vertices that behave weirdly if you have any, make sure you don't accidently delete faces)
Make a circle with Shift+A, subdivide it 4 or 5 times, add a Boolean modifier targeting your imported svg and you should get this




Here is the .blend file: